CVE-2021-31566

Name: CVE-2021-31566
Creator: NVD / NIST
Published: 2022-08-23T16:15:09.337+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.37%

Last modified Jun 17, 2026

CVE-2021-31566 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An improper link resolution flaw can occur while extracting an archive leading to changing modes, times, access control lists, and flags of a file outside of the archive. An attacker may provide a malicious archive to a victim user, who would trigger this flaw when trying to extract the archive. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

An improper link resolution flaw can occur while extracting an archive leading to changing modes, times, access control lists, and flags of a file outside of the archive. An attacker may provide a malicious archive to a victim user, who would trigger this flaw when trying to extract the archive. A local attacker may use this flaw to gain more privileges in a system.

Metrics

CVSS 3.1

7.8/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

0.37%

28.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Libarchive	Libarchive	< 3.5.2
Fedoraproject	Fedora	35
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux Eus	8.6
Redhat	Enterprise Linux For Ibm Z Systems	8.0
Redhat	Enterprise Linux For Ibm Z Systems Eus	8.6
Redhat	Enterprise Linux For Power Little Endian	8.0
Redhat	Enterprise Linux For Power Little Endian Eus	8.6
Redhat	Enterprise Linux Server Aus	8.6
Redhat	Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions	8.6
Redhat	Enterprise Linux Server Tus	8.6
Redhat	Codeready Linux Builder	All versions
Debian	Debian Linux	10.0
Splunk	Universal Forwarder	>= 8.2.0, < 8.2.12
Splunk	Universal Forwarder	>= 9.0.0, < 9.0.6
Splunk	Universal Forwarder	9.1.0

References

https://access.redhat.com/security/cve/CVE-2021-31566Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2024237Issue Tracking, Patch, Third Party Advisory
https://github.com/libarchive/libarchive/commit/b41daecb5ccb4c8e3b2c53fd6147109fc12c3043Patch, Third Party Advisory
https://github.com/libarchive/libarchive/issues/1566Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00030.htmlMailing List, Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-31566Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2024237Issue Tracking, Patch, Third Party Advisory
https://github.com/libarchive/libarchive/commit/b41daecb5ccb4c8e3b2c53fd6147109fc12c3043Patch, Third Party Advisory
https://github.com/libarchive/libarchive/issues/1566Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/11/msg00030.htmlMailing List, Third Party Advisory

Timeline

Published: Aug 23, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31566?

How severe is CVE-2021-31566?

CVE-2021-31566 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31566?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31566?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST